petri dish

a shallow, circular, glass or plastic dish with a loose-fitting cover over the top and sides, used for culturing bacteria and other microorganisms.

1890–95; named after J. R. Petri (died 1921), German bacteriologist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Petri dish (ˈpɛtrɪ)
a shallow circular flat-bottomed dish, often with a fitting cover, used in laboratories, esp for producing cultures of microorganisms
[C19: named after J. R. Petri (1852--1921), German bacteriologist]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

petri dish
1892, named for Ger. bacteriologist Julius Petri (1852-1922), who first devised it c.1887.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

petri dish pe·tri dish (pē'trē)
A shallow circular dish with a loose-fitting cover, used to culture bacteria or other microorganisms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
petri dish   (pē'trē)  Pronunciation Key 
A shallow, circular dish with a loose cover, usually made of transparent glass or plastic and used to grow cultures of microorganisms. The petri dish is named after German bacteriologist Julius Richard Petri (1852-1921).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And sometimes it needs to be cultivated, grown as if it were delicate bacteria
  in a petri dish.
They were clustered in a little heap, after dividing in a petri dish for almost
  three weeks.
The number and density of people on this planet is a huge petri dish to grow
  anything resistant to our measures.
All scientists knew about glia was that if you put neurons in petri dish, you
  had to have glia, or neurons would die.
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